<template>
  <div class="cart">
    <h4>全部商品</h4>
    <div class="cart-main">
      <div class="cart-th">
        <div class="cart-th1">全部</div>
        <div class="cart-th2">商品</div>
        <div class="cart-th3">单价（元）</div>
        <div class="cart-th4">数量</div>
        <div class="cart-th5">小计（元）</div>
        <div class="cart-th6">操作</div>
      </div>
      <div class="cart-body">
        <ul class="cart-list" v-for="cartInfo in cartInfoList" :key="cartInfo.id">
          <li class="cart-list-con1">
            <input type="checkbox" name="chk_list" :checked='cartInfo.isChecked===1'
              @change="updateChecked(cartInfo,$event)"/>
          </li>
          <li class="cart-list-con2">
            <img :src="cartInfo.imgUrl" />
            <div class="item-msg">
              {{cartInfo.skuName}}
            </div>
          </li>
          <li class="cart-list-con4">
            <span class="price">{{cartInfo.skuPrice}}</span>
          </li>
          <li class="cart-list-con5">
            <a href="javascript:void(0)" class="mins" @click="handleSkuNum('minus',-1,cartInfo)">-</a>
            <input
              autocomplete="off"
              type="text"
              :value="cartInfo.skuNum"
              minnum="1"
              class="itxt"
              @change="handleSkuNum('change',$event.target.value,cartInfo * 1)"
            />
            <a href="javascript:void(0)" class="plus" @click="handleSkuNum('add',1,cartInfo)">+</a>
          </li>
          <li class="cart-list-con6">
            <span class="sum">{{cartInfo.skuNum * cartInfo.skuPrice}}</span>
          </li>
          <li class="cart-list-con7">
            <a class="sindelet" @click="deleteCart(cartInfo.skuId)">删除</a>
            <br />
            <a href="#none">移到收藏</a>
          </li>
        </ul>
      </div>
    </div>
    <div class="cart-tool">
      <div class="select-all">
        <input class="chooseAll" type="checkbox" :checked='isAllChecked'
          @change="updateAllCartChecked"/>
        <span>全选</span>
      </div>
      <div class="option">
        <a @click="deleteCartWhichAreChecked">删除选中的商品</a>
        <a href="#none">移到我的关注</a>
        <a href="#none">清除下柜商品</a>
      </div>
      <div class="money-box">
        <div class="chosed">已选择 <span>0</span>件商品</div>
        <div class="sumprice">
          <em>总价（不含运费） ：</em>
          <i class="summoney">{{totalPrice}}</i>
        </div>
        <div class="sumbtn">
          <a @click="$router.push('/trade')" class="sum-btn">结算</a>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import {mapGetters} from 'vuex'
import throttle from 'lodash/throttle' 

export default {
  name: "ShopCart",
  mounted() {
    this.getData()
  },
  methods: {
    // 获取个人购物车数据
    getData(){
      this.$store.dispatch('getCartList')
    },
    // 修改物品的数量（用节流）
    handleSkuNum:throttle(async function(whichone,quantity,cartInfo){
      switch (whichone) {
        case 'add':
          quantity=1
          break;
        case 'minus':
          if(cartInfo.skuNum>1){
            quantity=-1
          }else{
            quantity=0
          }
          break;
        case 'change':
          if(isNaN(quantity) || quantity<1){
            quantity=0
          }else{
            quantity=parseInt(quantity)-cartInfo.skuNum
          }
          break;
      }
      // 发请求
      try {
        await this.$store.dispatch('getAddCart',{skuId:cartInfo.skuId, skuNum:quantity})
        this.getData()
      } catch (error) {
        console.log(error);
      }
    },500),
    // 删除商品
    async deleteCart(skuId){
      try {
        await this.$store.dispatch('deleteCartBySkuId',skuId)
        this.getData()
      } catch (error) {
        console.log(error);
      }
    },
    // 修改商品的选中状态
    async updateChecked(cartInfo,$event){
      let ischeck=$event.target.checked ? '1' : '0';
      try {
        await this.$store.dispatch('getUpdateChecked',{skuId:cartInfo.skuId, isChecked:ischeck}) 
        this.getData()
      } catch (error) {
        console.log(error);
      }
    },
    // 删除选中的全部商品
    async deleteCartWhichAreChecked(){
      try {
        await this.$store.dispatch('deleteCartThatAreChecked')
        this.getData()
      } catch (error) {
        console.log(error);
      }
    },
    // 全选
    async updateAllCartChecked(event){
      let checked=event.target.checked ? '1' : '0' ;
      try {
        await this.$store.dispatch('updateAllCartChecked',checked)
        this.getData()
      } catch (error) {
        console.log(error);
      }
    }
  },
  computed:{
    ...mapGetters(['cartInfoList']),
    totalPrice(){
      let sum=0
      for (let i = 0; i < this.cartInfoList.length; i++) {
        sum =sum + (this.cartInfoList[i].skuNum * this.cartInfoList[i].skuPrice)
      }
      return sum
    },
    isAllChecked(){
      // every方法检测数组的每一个元素是否满足一个判断条件，返回true/false
      return this.cartInfoList.every((item)=>{
        return item.isChecked==1 //一定要加return
      })
    }
  },
  watch:{

  }
};
</script>

<style lang="less" scoped>
.cart {
  width: 1200px;
  margin: 0 auto;

  h4 {
    margin: 9px 0;
    font-size: 14px;
    line-height: 21px;
  }

  .cart-main {
    .cart-th {
      background: #f5f5f5;
      border: 1px solid #ddd;
      padding: 10px;
      overflow: hidden;

      & > div {
        float: left;
      }

      .cart-th1 {
        width: 25%;

        input {
          vertical-align: middle;
        }

        span {
          vertical-align: middle;
        }
      }

      .cart-th2 {
        width: 25%;
      }

      .cart-th3,
      .cart-th4,
      .cart-th5,
      .cart-th6 {
        width: 12.5%;
      }
    }

    .cart-body {
      margin: 15px 0;
      border: 1px solid #ddd;

      .cart-list {
        padding: 10px;
        border-bottom: 1px solid #ddd;
        overflow: hidden;

        & > li {
          float: left;
        }

        .cart-list-con1 {
          width: 15%;
        }

        .cart-list-con2 {
          width: 35%;

          img {
            width: 82px;
            height: 82px;
            float: left;
          }

          .item-msg {
            float: left;
            width: 150px;
            margin: 0 10px;
            line-height: 18px;
          }
        }

        .cart-list-con4 {
          width: 10%;
        }

        .cart-list-con5 {
          width: 17%;

          .mins {
            border: 1px solid #ddd;
            border-right: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }

          input {
            border: 1px solid #ddd;
            width: 40px;
            height: 33px;
            float: left;
            text-align: center;
            font-size: 14px;
          }

          .plus {
            border: 1px solid #ddd;
            border-left: 0;
            float: left;
            color: #666;
            width: 6px;
            text-align: center;
            padding: 8px;
          }
        }

        .cart-list-con6 {
          width: 10%;

          .sum {
            font-size: 16px;
          }
        }

        .cart-list-con7 {
          width: 13%;

          a {
            color: #666;
          }
        }
      }
    }
  }

  .cart-tool {
    overflow: hidden;
    border: 1px solid #ddd;

    .select-all {
      padding: 10px;
      overflow: hidden;
      float: left;

      span {
        vertical-align: middle;
      }

      input {
        vertical-align: middle;
      }
    }

    .option {
      padding: 10px;
      overflow: hidden;
      float: left;

      a {
        float: left;
        padding: 0 10px;
        color: #666;
      }
    }

    .money-box {
      float: right;

      .chosed {
        line-height: 26px;
        float: left;
        padding: 0 10px;
      }

      .sumprice {
        width: 200px;
        line-height: 22px;
        float: left;
        padding: 0 10px;

        .summoney {
          color: #c81623;
          font-size: 16px;
        }
      }

      .sumbtn {
        float: right;

        a {
          display: block;
          position: relative;
          width: 96px;
          height: 52px;
          line-height: 52px;
          color: #fff;
          text-align: center;
          font-size: 18px;
          font-family: "Microsoft YaHei";
          background: #e1251b;
          overflow: hidden;
        }
      }
    }
  }
}
</style>